The Zope 3 development community is discussing a move from CVS to Subversion, and the Plone people are also interested in doing this, if SVN hosting was available ala SF.net. I haven't used SVN yet, I think it's about time I start learning about it. A Google search turned up this:
I'm sure I'll find more good information as time goes on, but I've run out of time to do that right now. If you know of good links for learning Subversion please email me.